Power transmission

Details Power transmission Power transmission

1986-08-29

1988-07-19

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

91363R, F15B 1316

Patent

active

047577479

ABSTRACT:
An electrohydraulic system includes a plurality of electrohydraulic devices individually controlled by on-board microprocessor-based control electronics. Each individual device controller is connected to and addressable by a master controller for coordinating operation of the various devices. An electrohydraulic servo valve assembly includes a hydraulic manifold having a valve spool variably positionable therein under control of a torque motor. A microprocessor-based controller is connected to the torque motor and is mounted on the manifold by a cover which encloses and protects both the controller and the torque motor. A watchdog timer in the microprocessor-based controller monitors pulsewidth modulated signals to the torque motor for terminating operation in the event of signal loss. In a preferred embodiment of the invention, the servo valve assembly is coupled to a linear actuator which has its position monitored by an electroacoustic transducer. Improved electronics couple the transducer to the control microprocessor.

REFERENCES:
patent: 3555970 (1971-01-01), Borgeson
patent: 3898555 (1975-08-01), Tellerman
patent: 4481451 (1984-11-01), Kautz et al.
patent: 4625622 (1986-12-01), Gunda et al.

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